Strange error while root patching OCLP 1.41, MacBook Pro 9.2, Sonoma

Root patching fails as seen on the attached screenshot. Background:

- first install from USB-Installer on a fresh formatted SSD was ok, test-user created

- everything seems to work ok

- root patches removed to perform migrationassistent.app (as proposed in the docs)

- migration done via ethernet from a Mac Pro 5.1 using the same OCLP- and Sonoma-versions as source

- finished migration without problems

- migrated user is visible and can be accessed, looks ok, data present, Sonoma wallpaper displayed

- after some seconds the display turns white and not clear (the typical effect of missing root patches ..)

- message from OLCP to perform root patching - initiated

- looks good but the last step fails

Tried several times even with reinstalling the os from the US-stick used for the initial install, removing root patches and retry root patching ..

Any idea what is the reason for this problem ? Help is very much appreciated :)